I am trying to make OpenERP work with fiscal printer and I need to write to a variable <invoice.name> value of 'cash', 'cheque' or 'no-receipt' when the 'Validate' button is pressed.

What I need is to call a menu with drop down list with those three options. Similar to using 'Refund' which then offers options for 'cancel_invoice', 'draft_invoice', ...

I will then manipulate with code using <invoice.name> variable.

Additionally, if I could place check box at that dialog with some text 'Add predefined notice to invoice' it would be awesome :)

Thanks guys, I just love OpenERP.